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Some IndexedDB classes (IDBCursor, IDBRequest, IDBTransaction, and
IDBVersionChangeEvent) were using static local AtomicStrings on different
threads. This is safe, as long as these static strings are properly
created - which they were not. Switching to an initialization mechanism
which mirrors the Core static strings fixes this.

BUG=393728

Review URL: https://codereview.chromium.org/426063010

git-svn-id: svn://svn.chromium.org/blink/trunk@180205 bbb929c8-8fbe-4397-9dbb-9b2b20218538